Java StringBuffer

What is StringBuffer in java programming ?

StringBuffer is a peer class of String that provides the functionalities of strings.

String represents fixed length immutable character sequences but StringBuffer is growable and mutable character sequences.

StringBuffer may have characters and substrings inserted in the middle or appended to the end. StringBuffer automatically grow to make room for such additions and often has more characters preallocated than actually required.

StringBuffer Constructors

StringBuffer()
StringBuffer(int size)
StringBuffer(String str)

StringBuffer Methods Example

public class StringBufferTest {
	public static void main(String args[]){
		StringBuffer sb = new StringBuffer("Testing");
		System.out.println(sb.toString());
	
		System.out.println("Length:");
		System.out.println(sb.length());
		System.out.println("Capacity:");
		System.out.println(sb.capacity());
		System.out.println("After append:");
	        sb.append(" Codingpointer.com!");
		System.out.println(sb.toString());
		sb.insert(0, "Hi,");
		System.out.println("After insert:");
		System.out.println(sb.toString());
		sb.delete(0, 4);
		System.out.println("After delete:");
		System.out.println(sb.toString());
		sb.setLength(6);
		System.out.println("After setLength:");
		System.out.println(sb.toString());
		sb.setCharAt(0, 'h');
		System.out.println("After setCharAt:");
		System.out.println(sb.toString());
		sb.reverse();
		System.out.println("After reverse:");
		System.out.println(sb.toString());
		
	}
}

$ javac StringBufferTest.java
$ java StringBufferTest 
Testing
Length:
7
Capacity:
23
After append:
Testing Codingpointer.com!
After insert:
Hi,Testing Codingpointer.com!
After delete:
esting Codingpointer.com!
After setLength:
esting
After setCharAt:
hsting
charAt:
n
After reverse:
gnitsh

ensureCapacity method

void ensureCapacity(int capacity);

Here capacity specifies the size of the string buffer.





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